Results 71 to 80 of about 3,169 (205)

Imaging the Small-Scale Circumstellar Gas Around T Tauri Stars [PDF]

, 1995
We have detected circumstellar molecular gas around a small sample of T Tauri stars through aperture synthesis imaging of CO(2→1) emission at ˜2"-3" resolution. RY Tauri, DL Tauri, DO Tauri, and AS 209 show resolved and elongated gaseous emission. For RY
Sargent, A. I., Koerner, D. W.
core  

Gas-Phase Synthesis of Coronene through Stepwise Directed Ring Annulation

, 2023
Molecular beam experiments together with electronic structure calculations provide the first evidence of a complex network of elementary gas-phase reactions culminating in the bottom-up preparation of the 24π aromatic coronene (C24H12) moleculea ...
Yahaira Reyes (14511379), Lotefa B. Tuli (14278686), Patrick Hemberger (710154), Ralf I. Kaiser (1793893), Stanislaw F. Wnuk (1317564), Andrew M. Turner (11868067), A. Hasan Howlader (5104529), Shane J. Goettl (11014649), Alexander M. Mebel (1566913)   +8 more
core   +1 more source

Dust-evacuated Zones near Massive Stars: Consequences of Dust Dynamics on Star-forming Regions

The Astrophysical Journal
Stars form within dense cores composed of both gas and dust within molecular clouds. However, despite the crucial role that dust plays in the star formation process, its dynamics is frequently overlooked, with the common assumption being a constant ...
Nadine H. Soliman, Philip F. Hopkins, Michael Y. Grudić   +2 more
doaj   +1 more source

The deep eclipses of RW Aur revisited by long‐term photometric and spectroscopic monitoring

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract RW Aurigae is a young stellar system containing a classical T Tauri star as the primary component. It shows deep, irregular dimmings, first detected in 2010. At the University Observatory Jena, we carried out optical follow‐up observations. We performed multiband (BVRI) photometry of the system with the Cassegrain‐Teleskop‐Kamera II and the ...
Oliver Lux, Markus Mugrauer, Richard Bischoff   +2 more
wiley   +1 more source

Simulating the birth environment of circumstellar discs

, 2021
Circumstellar discs are the reservoirs of gas and dust that surround young stars and have the potential to become planetary systems. Their evolution will determine the time and material available to form planets.
Concha Ramirez, F.A.
core  

Spectroscopic Evolution of Disintegrating Planetesimals: Minute to Month Variability in the Circumstellar Gas Associated with WD 1145+017 [PDF]

, 2017
With the recent discovery of transiting planetary material around WD 1145+017, a critical target has been identified that links the evolution of planetary systems with debris disks and their accretion onto the star.
Farihi, J., Redfield, S, M. Duvvuri, Girish, Farihi, J, Gaensicke, BT, Boris T. Gänsicke, Girish M. Duvvuri, Cauley, P.W., Cauley, PW, Jay Farihi, M. Duvvuri, G., Redfield, Seth, Parsons, Steven G., Gänsicke, B. T. (Boris T.), Parsons, SG, Cauley, P. Wilson, Gänsicke, B.T., Duvvuri, GM, Parsons, S.G., Steven G. Parsons, Farihi, Jay, Seth Redfield, Redfield, S., P. Wilson Cauley   +23 more
core   +1 more source

Seven white dwarfs with circumstellar gas discs II: tracing the composition of exoplanetary building blocks

This second paper presents an in-depth analysis of the composition of the planetary material that has been accreted on to seven white dwarfs with circumstellar dust and gas emission discs with abundances reported in Rogers et al.
Klein, B. L., Walton, C., Xu, S., Weinberger, A., Bonsor, A., Kissler-Patig, M., Hodgkin, S., Buchan, A. M., Rogers, L. K., Dufour, P., Melis, C.   +10 more
core   +3 more sources

Hourglass Magnetic Field of a Protostellar System

Universe
An hourglass-shaped magnetic field pattern arises naturally from the gravitational collapse of a star-forming gas cloud. Most studies have focused on the prestellar collapse phase, when the structure has a smooth and monotonic radial profile.
Shantanu Basu, Xiyuan Li, Gianfranco Bino   +2 more
doaj   +1 more source

Limitations of the modified blackbody fit method for determining molecular cloud properties

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract Achieving a comprehensive understanding of the star and planet formation process is one of the fundamental tasks of astrophysics, requiring detailed knowledge of the physical conditions during the different phases of this process. During the earliest stages, that is, concerning physical processes in molecular clouds and filaments, the column ...
Niko Zielinski, Sebastian Wolf
wiley   +1 more source

Circumstellar gas and dust in 68 Ophiuchi (A0IVe)

Astronomy & Astrophysics, 1995
We present photometry and spectroscopy of the A0IVe star 68 Ophiuchi, for which Vidal-Madjar et al. (1993) suspected the presence of a circumstellar disc of material similar to that found around beta Pic. The UV and optical continuum agrees well with a Kurucz model with parameters that are consistent with the spectral type. 68 Oph is detected at 12 and
Waters, L.B.F.M., van den Ancker, M.E., Baas, F., van der Bliek, N.S., Bontekoe, T.R., Geballe, T.R., Grady, C.A., Kester, D.J.M., Oudmaijer, R.D., Sandell, G., The, P.S., Vega, R., van Winckel, H.   +12 more
openaire   +2 more sources